ClickSend REST API v3 vs ViaCep
Same instrument, two spec sheets — measured, not claimed.
ClickSend REST API v3 vs ViaCep: common questions
Which is more reliable, ClickSend REST API v3 or ViaCep?
On our scheduled checks, ClickSend REST API v3 leads on measured uptime — ClickSend REST API v3 at 100% versus ViaCep at 98.0% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, ClickSend REST API v3 or ViaCep?
ClickSend REST API v3 has the lower median latency in our checks — ClickSend REST API v3 responds in 324 ms versus ViaCep at 651 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do ClickSend REST API v3 and ViaCep need an API key?
ViaCep needs no key, while ClickSend REST API v3 requires a free API key. If you want to start calling without signup, reach for ViaCep first.
Can I call ClickSend REST API v3 and ViaCep from the browser?
Yes — both ClickSend REST API v3 and ViaCep send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are ClickSend REST API v3 and ViaCep free for commercial use?
ClickSend REST API v3 has unclear commercial terms, and ViaCep has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.